Black polyazo dye and process of making same.



UNITED STATES PATENT orirroa.

AUGUST LEOPOLD LASKA, OF OFFENBACH-ON-THE-MAIN. GERMANY,

ASSIGNOR TO CHEMISOHE 'FABRIK GRIESHElM-ELEKTRON, .OFvFRANKFOltT-ON-THE-MAIN, GERMANY; A CORPORATION.

BLACK POLYA ZO DYE AND PROCESS OF MAKING SAME-v Specification of LettersPatent.

Patented. Oct. 2, 1900.

Application fil d March 21,1906. Serial No. 307,273.

To all whom it may concern.-

Be it known that I, AUGUST LEoPoLD LASKA, doctor of philosophy, chemist,and a resident of '5 Gerberstrasse, Offenbach-onthe-Main, in the GrandDuchy of Hessen, German Empire, have invented a new and usefulImprovementin Black Polyazo Dyestuffs'and Processes of Makin the Same,of which the following is a speci cation.

I, have found that valuable azo d estuiis dyeing cotton black shades are0 tained when the intermediate products from tetrazotized diamido bases.and sulfonic acids of the 2 :8 amido naphthol are further diazotized,then first combined with the amidoazo dyestuff obtained from paraphenylendiamin sulfonic acid and 2:5 ,amidonaphthol-7-sulfonic acidhaving the formula:

some and further combined with meta diamins' of the benzene series.Among the 2:8 amido naphthol sulfon'ic acids the2z8 amidonaphthol-6-sulfonic acid and the2 :8 amido naphthol3z6 disulfonic acidmay be used.- In

the general termdiamido bases benzidim, and para phenylendiamin;

N nou I some and to transform in the ready combined azo dyestuifthenitro group into the amido group by reduction in an alkaline solution.

of the new i: dyestuffs into practical efiect it is better in- The thus-'obtained dyestuffs dye cotton deep-black shades remarkably fast toWashing. They can be diazotized on the fiber and combined with phenolsand amins.

The following example will illustrate the nature of my invention." Theparts are by Weight.

Exam 1e: Ten and six-tenths parts of tolidin are iazotized by means oftwent -eight and a half parts of hydrochloric acid (20 Baum) and six andnine-tenths parts of sodium nitrite; This diazo compound is combinedwith 1 1.95 parts of 2 :8 :6 amido naphthol sulfonic acid in alkalinesolutionin the usual whole is acidified with hydrochloric acid andfurther diazotation effected by means of three and a half parts ofsodium nitrite. This diazo compound is allowed to run into a sodaalkaline solution of the monoazo dyestuff obtranilin-o-sulfonic acid and11.95 parts of 2 :5 :7 amido naphthol sulfonic acid in acid so-' lution.As soon as the intermediate product has formed a solution of 5.4 partsof meta phenylendiamin is added. In order'to reduce the nitro group, asolution of thirt six arts of sodium sulfid, is added and t e who eheated up to 50 centigrade. To complete the reaction, this tem eratureis maintained during two hours. he coloring-mat ter is precipitated bymeans of common salt, filtered off, and dried.

powder of metallic luster. concentrated sulfuric acid and water with ablue-black color. Its aqueous solution is scarcel altered by soda-lye.On addition of hydroc oric acid the dyestufi is precipitated inblue-black flakes. t dyes cotton deepblack shades.

The above example is merely typical, and I do not confine myself to itsdirection, as they may be varied. For instance, the meta phenylendiaminma be replaced by meta toluylendiamin, toli by benzidin, dianisidin, orthe tetrazo compounds resulting by combining para nitranilin withsulfonic acids of the 2 :S-amido naphthol, reducing the nitro on anddiazotizing the resultin amideazo yestuii by means of two molecu es ofsodium nitrite.

The like dyestuffs can be obtained by sinmanner. When combination isended, the 7 tained by combining 10.9 parts of para m- The dyestufiobtained forms a brown-black I It dissolves in nitro group and dyestuiisconamido group instead of a splitting off the acetyl lgroup in the readycombined dyestufi in the nown manner.

Now what I claim, Letters Patent, is the 1. The

ploying for the combination taining an acetyl and desire to secure byfollowing: i process of making azo dyestuffs further diazotizing theintermediate prod nets of the tetrazo compounds of the hereinbefore-defined diamido bases and sulfonic acids of-the 2 :8 amidonaphthol and combining with the monoazo dyestufi" obtained from paranitrani'lin sulionic acid and 2:5 amido naphthol-7-sulfonic acid, andcombining this intermediate product with a meta diamin of" the benzeneseries and on in the read fluff? thus obtained.

2-. The new polyazo dyestufls which result, when the intermediateproducts ofthe tetrazo com ounds of the hereinbef'ore-defined diami "obases and sulfonic acids of the 2:8

reducing the nitro combined polyazo dyeamid'o naphthol-T-sulfbnic acidin acid solution, and further combined witha meta dialnin of the benzeneseries, and on which, ready combined, the reduced; which dyefter theyhave been nitro group has been ;my invention .13 have si'g stufl's forma brown-black powder of metallic luster, dye cotton black shades, andwhich dissolve in concentrated sulfuric acid and water witha blue-blackcolor, from which latter solution the dyestufi is reci itated byhydrochloric acid in blue-blac fia es.

3. The polyazo dyestuffs, which are duced by further diazotizing theintermediate products from tetrazo compounds of the herelnbefore-defineddiamido bases and 2:8 amido naphthol-6sulfo acid, then combining thisproduct first with the monoazo dyestu amido naphthohobtained'inacid'sol'ution, and further with a meta diamin of the benzene series,and reducin the nitro group in the ready combined po yazo dyestuffs,which dye cotton black tints and form brown-black powders of metallicluster, dissolve in concentrated sulfuric acid andwater with a blue--reei i'tated by hydrochloric acid in blueflal es. In testimony that Icl'aim the foregoing' as ned my name, in

black color, from which latter solution they. are

' blac amide naphthol' are further diazotized'",- comf bined with themonoazo; dy'estufi} obtained from para nitranili-n sulfonic acid and 2:57

pro-

resenceof' two witnesses, this day of l arch, I906. v

' AUGUST LEOP-OLD LASKA. itnesses:

EVA SATTLER,

Gsone LIST.

